At least 13 people were killed and another 16 injured during a tribal clash over water dispute in Kurram agency, a private TV on Sunday. According to the report, the clash between two tribes over the water issue in the above-mentioned area, namely Mangal and Bangash, has lasted for weeks. The resumed fighting between the two tribes overnight on Sunday has killed a total of 115 people and injured 166 others within the past two weeks, said the report, adding that dozens of houses have also been burnt to ashes in the clashes.